Telephonic device.



No. 818,767. PATENTBD APR. 24, 1906.

I. KITSEE. TBLBPHONIC DEVICE.

APPLIGATION FILED JUNE15, 1903.

2 SHEETS-SHEET 1.

RQMM/ PATENTED APR. 24A 1906.

I. KITSEB.

TELEPHONIG DEVICE.

APPLICATION FILED JUNE 15, 190s.

2 SHEETS-SHEET 2,

wif Yue/awo manual labor consisting of the clearing of the ISIDOR KITSEE, OF PHILADELPHIA, PENNSYLVANIA.

TELEPHONIC DEVICE.

Specification of Letters Patent.

Patented April 24, 1906.

Application filed June 15,1903. Serial No. 161,619.

To (LM whom, it may concern:

Be it known that I, lsIDoR K1TsEE,of the city and county of Philadelphia, State of Pennsylvania, have invented certain new and useful Improvements in Telephonie Devices, of which the following is a specification.

My invention relates to an improvement in telephonicdevices, and has more specialfreferences to the plug and jack for same used in central stations'.

Two substations are today connected for the purpose of intercommunication through what is technically called connecting-cord or plug The main operations are as 'follows: The operator is made aware of the calling of the subscriber through the lighting of the lamp connected to the respective circuit. She ascertains the number of the subscriber called for, inserts one plug of the cord-circuit into the jack of the circuit calling and one plug into the ack of the circuit to be called. She then rings up the desired subscriber, and these two subscribers circuits are, after the second subscriber has answered, ready for intercommunication. Vhen the conversation is at an end-that is, when one or the other of the subscribers has replaced his receiver on the hook-the operator is made aware ofthe fact through supervisory and pilot lamps and has then to take these plugs out of their respective jacks and clear the line.

lt is the object of my invention that the line should be dispensed with, and it is also the aim of my invention that the ringing up should be automatically performed.

For this purpose my invention consists in the devices and arrangements as will hereinafter be described, illustrated in the drawings, and more clearly pointed out in the claims following the specification.

Referring to the drawings, Figure lis a longitudinal section through the plug, the magnet being in elevation. Fig. 23's a longitudinal section through one of Lfthe jacks of the switchboard, showing thesame in its normal position and its connection,diagrammatic-l ally to a source of electricity. Fig. 3 is an end view'of the shell or tubing of this jack with its inner insulation. Fig. 4 is a longit-udinal section of one of the jacks, showing a plug inserted in. same. Fig. 5 is a diagrammatic view of the plug-circuit. Fig. 6 is a diagrammatic view illustrating two subscribers stations connected together through my improved plugs, one of the stations being rung up. Fig. 7 is a similar view illustrating the same circuits in a posit-ion ready for communication.

In Fig. l, A is the plug proper, consisting of the conducting shell or tube B, the electromagnet C, embracing the soft-iron core b, and the coils c. The plug also embraces the insulation a, insulating the electromagnet and core of same from the shell or tube B. The shell is electrically connected with wire l, the core b is electrically connected with wire 2, and the terminals of the coils c are electric.- ally connected with the wires 3 and 4. l have after repeated experiments found that the electromagnet substantially as illustrated in Fig. l and substantially of the same dimensions, is best adapted for the purpose in view. Each of the legs of this electromagnet is of semicircular form and the windings consist of four layers of No. 30 wire. The outer diameter of this plug is one-half inch and the length of the plug is substantially about two and three-fourths inches. lith three cells the electromagnetic pull of the core is sufficiently strong for all purposes, but it is obvious that the shape of the core. as well as the number of windings of the coils, may differ according to requirements.

ln Fig. 2, which illustrates the preferred form of the jack, D is the jack proper, embracing the conducting shell or tube E, the stationary soft iron F, the movable conduct ing piece or'rod G, preferably held in position with the aid of the spring f and the collar g.

v To this movable conductor or rod is secured the contact h, here in the shape of a spring, and to the shell E is secured the Contact provided with the adjustable screw n. This contact is adapted to be pressed outwardly with the aid of the movable conductor or rod G. To the shell are secured, but insulated therefrom, the stationary contacts i and y'. The shell E is electrically connected to the wire 5, this wire being a continuation of one of the line-wires of the outlying subscribers station, and Vthe stationary piece of soft iron F is in electrical connection with wire 6, being a continuation of the second line-wire of the outlying subscribers station. To the contacts 'i and j, respectively, is connected, through wires 8 and 7, the source of current H. l have not illustrated the different de- IOO vices usually placed in the circuit of one or the other of the subscribers lines-such, for instance, as an annunciator or operators hone, @cc-because these devices do not orm part of my invention and may be placed at any desired oints in the circuits 5, 6, 7, and 8, as is indicated in the drawings by the dotted lines. The outer shell E is insulated from the soft iron F by the insulation o, which I preferably make in the shape of a paper tube fitting over the piece of soft iron. The contact lc is provided with the insulation m. Normally, therefore, the electrical connection of the jack D is as follows: The two line-wires of the respective circuit are connected, through 5 and 6, with the shell and soft iron, respectively. The movable rod G,

and therefore the soft iron F, is, through they spring fh and contact c', electrically connected with one pole of the battery H'. is through contact-point @screw n, and contact 7c, in electrical connection with the other! pole of the battery H. When, therefore7 theI subscriber closes his circuit, the current generated at H will iiow through 7,1', n, lc, 5 and.

will return through 61F, G', 7L*, @'and 8 to thee other poleof. sai battery, not counting theI intervening devices inserted' in the circuits: 5 6 or 7 8. The subscriber therefore is enabled to call up theV operator through the closing ofthe circuit at his station to actuate such annunciating device aslamps,&c.andi

tocommunicate with her with the aid of her` phone inserted in one or the other of the circuitsdescribed.

In Fig. 4 the'plu as illustrated in Fig. 1, and the jack, as ilustrated in Fig. 2, are shown; but the plug is illustrated as being insertedl into the jack in a manner sodas to make electrical contact with same andto break the electrical contact of the jack with the-,source'of current H. As was-illustrated in Fig. 1', the shell B ofthe plug A is electrically connected to wire 1, and as this shellAv is now, with the plug inserted in the jack, in electrical-.connection with the shell Eof said jack, .it follows that wire 1 is electrically connectedv with thecircuit-wire 5 ofthe outlying subscribers.stationand' as, as is illustrated in Fig. 1, the wire 2 is connected to the core b of the electromagnet C, and as this core is now inelectricalcontact with the soft iron F of. the jack. it follows that` wire 2 is electrically connected'with the circuit-wire 6 ofthe outlying.V subscribers station: At the same time. the former connection of the shell E with'wire 7 ofl the battery H and the former connection of the soft iron F with wire 8 of the samebattery is broken.

In Fig. 5, M is the connecting-cord as an entirety, of which A and A are the plugs proper. 9 andlO are the conducting-lines of the cord, line 9 bein connected, through wires 1, with the she l`s B' and B respec- The shell El and line 10, through wires 2., with the cores b a'nd b, res ectively. One of the terminals of the coi s c is connected, through wires 4 and 11, to one pole of the batteryv I, the other pole of which is connected, through wires 11 and 4, with one terminal of the coil c. The second terminal of the coil c is connected, through wire 3, with the cord-line 10 and the second terminal of the coil c is connected, through wire 3, with the cord-line 9. The battery I is therefore connected in multiple arc as to the two cord-lines 9 and 10. As long as these two lines 9 and 10 are not connected at their terminalsthat is, as long as the shell Bl is not connectedv electrically with the core b orthe shell B not connected electrically with the core b/-the circuit of Ithe battery I is open andl no current will 'flow through its circuit or through the coils to the cord-lines; but as soon as either B is connected with b or B is connected with b1 a path for the electric current is established. In the lines 9 and 10 are inserted the coils l' and Z of the electromagnet K in a manner sothat if the current is flowing in the same direction through 9 and 10I simultaneously the action of one of the coils on the softiron core Z2 will be neutralized through the action of the second ofv said coils on said core,r and this core will therefore re- `main in its neutral or unmagnetizedv state; but if: the current is only iiowing through line 9 or through-line10alone, then the coil connectedto such line will be in a` position to entively,

Z2 is the armature g, normally resting on the v contact p through the action of the s ring g', but adapted to be contacted witht e contact p as soon as the core Z2 is energized.

the source ofcurrent L, grounded with the other pole at R. Normally therefore-that is, when the electromagnet K is not activethe circuit of the battery- Ii is not closed and no currentA will'iiow through-the same. l

In Fig. 6 the connecting-cord is shown in operation andy connecting' the subscribers' stations S andA S. It is assumed that the-station S' has calledup the central and that the operator has connected the circuit of S with the circuit ofthe subscriberasked for,v(in the drawing illustrated, as S.) This subscriber has notas yet answered. As will-beseen, the usual bridge-circuit at the subscribers stations is entirely omitted, so also arethe derived circuits containing. the alternating bell andcondenser omitted. Instead of these derived or bridge circuits, circuits are established to the ground r and r, including the ordinary makeand-break bells s and s', adapted to be actuated by a direct current. Thenormal position of the device and arrangement of circuits at the subscribers station are shown at S and the arrangement of er ize the core Z2. In proximity to the core This armature gis connectedwith-one pole of IIO the circuits adapted to communicate either with the central or with a second subscriber is illustrated at S. As said above, this figure illustrates the connection of two subscribers, wherein one subscriber has called for a connection with a second subscriber and wherein the central is in the act of calling up this second subscriber. The electrical connection in this case is as follows: From the battery I the current will flow tlu'ough the coil c', wire 9, shell B, wire 6, through the line of the subscriber' and devices inserted in said line back through the second line, wire 5, core b, coil c, and wire 11 to the other pole of the battery. rlhe path, including wires 5 and and linewires of S, is interrupted for the reason that the lever at the subscribers station is still at the lower point and out of contact with the upper contact. At the same time the current flowing through 9, and therefore the coil attached to said line, will energize the core of the electromagnet K, thereby bringing in contact the armature g with the contact p, establishing a circuit for the battery L, as follows: Battery L, armature q, contact p, part of line 10, core b, wire 6, one line of the subscribers circuit, bell s, ground 1", ground R, back to the batteryL. The bell, as stated above, is supposed to be of the usual type of make and break and will therefore ring as long as the lever will be in contact with the grounded circuit. In Fig. 7 the same connection is shown as in Fig. 6 with the exception that the subscriber at station S/ has through the removing of his receiver from the hook, answered the call and with the exception that through this removing the lever, formerly in contact with the grounded circuit, is now out o f contact with same and is contacted with the other line of its main circuit. Through the breaking of this grounded circuit the path for the current of the battery L is interrupted and the bell will cease ringing. At the same time through the closing of the main line at S a second path is established for the battery I, and this path consists of wire 1l, connecting the positive pole to coil c through said coil, wire 5, one leg of the main subscriber-line, and back through the second leg of said line, wire 6, core b, wire l0, coil Z, through part of wire 1l), coil c, back to the battery through wire l l. The current generated by this battery I has therefore a double path. One path includes cord-wire 9 and coil l and the second path includes wire 1,0 and coil Z, and as the action of these two coils is to oppose each other in their magnetizing effect on the core l2 it is obvious that this core will be demagnetized and the armature q will fall away from the point p and will come to rest at p. It is proposed that the battery I shall furnish the "talking-currents, and both of these subscibers S and S can now communicate with each other. I have not taken into consideration in the description of these two figures thc intervening devices placed in the central station and l have not taken into consideration the different parts of the jack into which in reality the plugs are inserted, and I have shown the two wires 6 and 5 as being directly connected without the intervention of any jack parts to the plug proper, this for the purpose of simplification.

From the description so far it can be deducted, first, normally the subscriber-circuit is connected through the jack with thel battery II, and the subscriber has it in his power, through thc closing of his circuit at his station, to call up the central and communicate therewith; second, the operator at central, after having ascertained the wishes of the subscriber and after having ascertained that the called-up subscriber is not busy, connects the two subscribers, calling and called for, by simply placing the two plugs of one plug-circuit into the respective jacks 3 third, as the circuit of the subscriber calling is closed the battery attached to this plug-circuit will energize the electromagnet of both plugs, and both plugs will therefore adhere to the jack by magnetic action; fourth, the circuit called for will be automatically rung up through the action of the grounded battery; fifth, the ringing will cease automatically as soon as the called-for subscriber has answered; sixth, as long as one or the other' of the subscribers wishes to communicate the plugs will remain in their position, but will be automatically released as soon as both subscribers have placed their receivers on the hooks, for the reason that then both paths for the battery connected to the cord-circuit arc interrupted.

Among the other advantages of this system are the following: First, at the subscriber-station it is not necessary to place the comparatively dear alternating bells and condensers; second, it is not necessary to bridge or otherwise branch the main circuit at such station g third, at the central station it is unnecessary to have generators of alternating currents and to transmit such currents of sufficient strength to actuate bells, which transmission is always harmful fourth, at the central such devices as supervisory or pilot lamps will be made unnecessary, and,iu fact, the whole arrangement of connecting and disconnecting bc simplified. i

I have described this system lin conjunction with the automatic ringing up; but it is obvious that this feature may be dispensed with without departing from the scope of my invention.

I have illustrated the tube or shell E of the jack as to extend beyond the stationary soft iron F, for the reason that the plug when inserted should be to a great part inclosed in IIO said tube, so that falling plugs will not beV able to disturb its position.

The manner of forming all contacts illustrated in the most convenient form; but it is obvious that the shape of same may vary according to requirements.

Wherever I have in this specification or in the claims following this specification referred to connecting-cord or cord-plug, I understand under the same the device necessary to connect electrically two outlying stations with each other for the purpose of intercommunication. and description oi same it is apparent that the connecting-cord carries the current necessary for intercommunication between the two subscribers connected. It is also apparent that the circuit including the source of current is in multiple arc as to the circuits connected. It is therefore advisable that the shunting of telephonic circuits through such bridge should be prevented, and the coils c and c may be made to act as the necessary impedance; but where a separate impedance is desired such may be inserted in the circuit in any of the well-known manners.

I have described and illustrated the connecting-cord as to embrace two plugs, each provided with electromagnetic means; but in some systems each subscriber in charge of an operator is provided with a separate cord normally connected to his circuit. case, as is obvious, the connecting-cord does not need to embrace two plugs, and the connecting means therefore needs only to include one plug and only one connecting-magnet.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, isp l. In telephony a connecting-cord consisting of the cord proper, two plugs electrically connected to said cord, each of said plugs embracing an electromagnet and a source of current, said source of current connected in multiple arc as to the two conductors of said cord.

2. In telephony a device adapted to connect two outlying circuits electrically with each other, said device consisting of twoconducting-lines, two plugs carrying the terminals of said lines, each plug provided with an electroma gnet, a third line including a source of current and connected to the first two lines, said third line including the coils of said electromagnets.

3. In combination with two acks to which the terminals of two outlying telephonic circuits are electrically connected, a connectingcord consisting of two metallic conductors constituting the line proper, two plugs carrying the terminals of said conductors and adapted thereby to connect said conductors with said jacks, each plug provided with an From the illustration In this electromagnet connected to a current-carrymg c1rcu1t, said current-carrying circuit 1n electrical contact with said llnes.

4. In combination with two outlying telephonic circuits, a jack for each of said circuits, each jack embracing a stationary soft iron and stationary and movable contacts, a plug for each of said jacks, each plug embracing an electromagnet and connecting means, said connecting means comprising metallic lines lconstituting the cord proper and a third line containing a source of current.

5. In combination a connecting-plug and jack for same, the plug-embracing means, electromagnetic in their action, to retain the same in position when placed in said jack, said jack normally connected to a source of current.

6. As a means to electrically connect two telephonic circuits, a connecting-cord consisting of two conductors insulated from each other but'electrically connected to a circuit containing a source of current, two electromagnets inserted in said circuit, each of said electromagnets carrying one ofthe terminals of each of said conductors.

7. In telephony, a connecting cord, an electromagnet provided with two coils, each of said coils connected to one of the lines forming said cord, in a manner so that the energizing influence ofthe coil inserted in one of said lines is neutralized by the energizing iniiuence of the coil inserted in the second of said lines and means in proximity to the core of said electromagnet to connect to one or the other of said lines a grounded source of electricity.

8. In combination with the terminals of two telephonic circuits a connecting-cord electrically connecting said terminals with each other, said cord provided with means, electromagnetic'in their action, to retain said connection as long as one or the other of said telephonic circuits is closed at the station of said circuit, and to break said connection automatically as soon as both ofthe circuits are open at their respective stations, said connecting-cord carrying with it the energy necessary for intercommunication between said stations.

9. In telephony, means to connect two outlying circuits, in combination with two jacks carrying the terminals of said outlying circuits, said jacks normally connected to one source of current and adapted to be disconnected from said source and connected with a second source through the insertion of the plugs of said connecting means, said jacks embracing stationary soft iron. I

10. In a telephonic system wherein two or more outlying stations center in one eX- change a connecting-cord for said exchange, said connecting-cord adapted to connect two of said outlying stations for the purpose of IIO IIS

intercommunication, and embracing three In witness whereof I hereby sign myname, conducting-lines, two electromagnetic plugs, in the presence ol two Subscribing witnesses, 1o und u source of current, this source of current this 12th day of June, A. D. 1903.

connected .through thee-oil Eof one of said ISIDOR KITSEE. electronmgnets to one hne ol said plug end connected through the coil of the second /Vitnesses: electromagnetic plugs to the second line of EDITH P. S'rILLEY, seid plug. R. lV. VILLRAHAM. 

